WordReference Random House Learner's Dictionary of American English © 2014
gay /geɪ/USA pronunciation  adj.,  -er, -est,n. 

  1. having or showing a merry, lively mood:in gay spirits.
  2. bright, showy, or attractive:gay colors.
  3. [often: be + ~] homosexual.
  4. [before a noun] indicating or relating to homosexual interests or issues:a gay organization.

n. [countable]
  1. a homosexual person, esp. a male.

Collins Concise English Dictionary © HarperCollins Publishers::

gay /ɡeɪ/ adj
  1. homosexual
  2. of or for homosexuals: a gay club
  3. carefree and merry: a gay temperament
  4. brightly coloured; brilliant: a gay hat
  5. given to pleasure, esp in social entertainment: a gay life
  1. a homosexual
Etymology: 13th Century: from Old French gai, from Old Provençal, of Germanic origin

ˈgayness n USAGE
Gayness is the word used to refer to homosexuality. The noun which refers to being carefree and merry is gaiety

'gay' also found in these entries:
In the English description:

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